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Callosal Agenesis: A Natural Split Brain? by Krystyna E. Wisniewski, Joseph S. Jeret (auth.), Maryse PDF

By Krystyna E. Wisniewski, Joseph S. Jeret (auth.), Maryse Lassonde, Malcolm A. Jeeves (eds.)

This ebook is dedicated to the outline of agenesis of the corpus callosum, a congenital malformation of midline buildings within the mind that could be considered as a common version of the "split-brain. " First mentioned via Rei! in 1812, this anomaly has in view that been defined via a number of investigators. curiosity during this malformation used to be revived within the Nineteen Seventies by means of stories of interhemispheric move in Bogen and Vogel's commissurotomized sufferers and the following findings by way of Sperry that acallosal sufferers have been without the common disconnection deficits present in sufferers with surgical transection of the corpus callosum. considering that this seminal paintings, the majority of neuropsychological learn on callosal agenesis has fascinated by the details of interhemispheric move and integration. An ever-growing literature has emerged at the topic, trying to specify the level and bounds of neural plasticity in a fearful method that has developed within the absence of an important interhemispheric pathway. while callosal agenesis proves to be a superb version of cerebral plasticity, it should be mentioned that this anomaly is usually linked to different malformations and neurological illnesses which could lead to diverse levels of psychological retardation or different cognitive and sensorimotor deficits. during this context, neurological examine on callosal agenesis has targeting the outline of assorted syndromes linked to this pathology in addition to at the try to specify its neurobehavioral manifestations.

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Jeeves, Plenum Press, New York, 1994 39 3 Figure 1. Pedigree of affected kindred. Figure 2. C. facial appearance. operation was found to be a large simple dermoid cyst. Epileptiform seizures have been a persistent post-operative problem. Close relatives claim to have observed changes in personality. T. I. scans (Figures 3, 4 and 5) show a low-density subfrontal abnormality with agenesis of the corpus callosum. The ventricles were noted to be significantly dilated. C. 40 Figure 3. C. T. Scan showing subfrontallesion with dilated lateral and third ventricles.

He responded well to antibiotics. T. I. scans (Figure 8) reveal a low density subfrontal mass and agenesis of the corpus callosum. The ventricles were noted to be dilated. Figure 7. e. Nasal Tomogram showing widening of septum extending into subfrontal region. M. b. C. presented at the age of twelve with a personality change. She too had a nasal discharge. She was noted to have hyperteleriorism, a widened nasal bridge and dennoid sinus below the glabella. She had poor recent memory, a perfonnance IQ on the Wechsler scale of 87 and a verbal IQ of 67.

White matter changes in the CNS similar to those seen in peripheral nerve were also observed. Loss of myelin and ballooning ofaxons suggesting a neurofilamentous disorder in the callosum and centrum semiovale were described (Carpenter, this volume). This syndrome, though quite different from giant axonal neuropathy, followed a similar path to clarification. It was obvious early on that the peripheral abnormalities were of a progressive nature, but it took several years before it became clear that progressive central nervous system involvement was also part of the clinical picture.

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